[R-390] DSP IF

[Veenstra, Lester]

Suggest one of the usual DBF mixers and an LO of 465 will give the
"audio baseband" for the soundcard demod while the image will not be a
concern

Lester Veenstra
Senior Engineering Program Manager
Intelsat General
6550 Rock Springs Drive, Suite 450
Bethesda Maryland, 20817
+1-301-571-1212
e-mail: lester.veenstra at intelsatgeneral.com
 

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net] On Behalf Of Cecil Acuff
Sent: Friday, April 22, 2005 12:54 PM
To: Bob Camp; Tom Norris
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] DSP IF

That's good news...I'll have to give it a try.  It would be interesting
to 
try an R-390A with the Pro II as it's IF chain up against a Pro II in
tough 
band conditions.

See how the two front ends and xtal oscillators against synthesis stacks
up!

Cecil..
----- Original Message ----- 
From: "Tom Norris" <r390a at bellsouth.net>
To: "Bob Camp" <ham at cq.nu>
Cc: <R-390 at mailman.qth.net>
Sent: Friday, April 22, 2005 10:44 AM
Subject: Re: [R-390] DSP IF


>I have tried the IF out to my Pro II. Works well. Just put the
> 390/390A in 16KHz, erm, I mean 16 KC bandwidth and connect
> the IF out to the Pro/ProII/ProIII *receive input* (so you won't
> transmit into your 390!!) Works great! I have considered taking
> the output directly from the final mixer before it goes to the
> IF deck, but have been too lazy to try since it involves taking the
> top cover off, which I can't do since the radio is in a rack (an open
> air rack, in case someone fusses) and I am especially too lazy
> to pull the radio, and my back, just to get a few more KC of band
> width.
>
> Tom NU4G
>
>>Hi
>>
>>The idea of putting a DSP IF processor on the IF output of an R390
sounds 
>>like an interesting project. The nice thing about the 390 is that you
can 
>>get at both the IF output *and* the AGC chain without modifying the
radio 
>>at all. Given the high performance RF section and the mechanical
filters 
>>the result should be very competitive.
>>
>>Of course this gets into the general direction of witchcraft and the
like 
>>....
>>
>> Enjoy!
>>
>> Bob Camp
>> KB8TQ
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